Zobrazeno 1 - 10
of 93
pro vyhledávání: '"Puschmann, K. G."'
Before using 3D MHD simulations of the solar photosphere in the determination of elemental abundances, one has to ensure that the correct amount of magnetic flux is present in the simulations. The presence of magnetic flux modifies the thermal struct
Externí odkaz:
http://arxiv.org/abs/1705.06812
Spicules of the so-called type II were suggested to be relevant for coronal heating because of their ubiquity on the solar surface and their eventual extension into the corona. We investigate whether solar spicules are heated to transition-region or
Externí odkaz:
http://arxiv.org/abs/1606.06132
Numerical 3D radiative (M)HD simulations of solar convection are used to understand the physical properties of the solar photosphere. To validate this approach, it is important to check that no excessive thermodynamic fluctuations arise as a conseque
Externí odkaz:
http://arxiv.org/abs/1306.6093
We estimate the formation height range contributing to broad-band and narrow-band filter imaging data in Ca II H to investigate whether spicules can be detected in such observations at the centre of the solar disc. We apply spectral filters of FWHMs
Externí odkaz:
http://arxiv.org/abs/1306.5199
Aims: We investigate the temporal evolution of magnetic flux emergence in the quiet Sun atmosphere close to disk center. Methods: We combine high-resolution SoHO/MDI magnetograms with TRACE observations taken in the 1216 {\AA} channel in order to ana
Externí odkaz:
http://arxiv.org/abs/1306.3393
Publikováno v:
Astronomy and Astrophysics, Vol. 553, A73, 2013
Most static 1D atmosphere models in the quiet Sun predict a rise of the gas temperature at chromospheric layers, but numerical simulations only yield an increase in the brightness temperature. We investigate the thermal structure in the solar chromos
Externí odkaz:
http://arxiv.org/abs/1302.6936
A small decaying sunspot was observed with the Vacuum Tower Telescope (VTT) on Tenerife and the Japanese Hinode satellite. We obtained full Stokes scans in several wavelengths covering different heights in the solar atmosphere. Imaging time series fr
Externí odkaz:
http://arxiv.org/abs/1301.1562
Autor:
Denker, C., von der Lühe, O., Feller, A., Arlt, K., Balthasar, H., Bauer, S. -M., González, N. Bello, Berkefeld, T., Caligari, P., Collados, M., Fischer, A., Granzer, T., Hahn, T., Halbgewachs, C., Heidecke, F., Hofmann, A., Kentischer, T., Klvaňa, M., Kneer, F., Lagg, A., Nicklas, H., Popow, E., Puschmann, K. G., Rendtel, J., Schmidt, D., Schmidt, W., Sobotka, M., Solanki, S. K., Soltau, D., Staude, J., Strassmeier, K. G., Volkmer, R., Waldmann, T., Wiehr, E., Wittmann, A. D., Woche, M.
In this review, we look back upon the literature, which had the GREGOR solar telescope project as its subject including science cases, telescope subsystems, and post-focus instruments. The articles date back to the year 2000, when the initial concept
Externí odkaz:
http://arxiv.org/abs/1210.3167
Autor:
Puschmann, K. G., Denker, C., Kneer, F., Erdogan, N. Al, Balthasar, H., Bauer, S. M., Beck, C., González, N. Bello, Collados, M., Hahn, T., Hirzberger, J., Hofmann, A., Louis, R. E., Nicklas, H., Okunev, O., Pillet, V. Martínez, Popow, E., Seelemann, T., Volkmer, R., Wittmann, A. D., Woche, M.
Publikováno v:
Astronomische Nachrichten Volume 333, Issue 9, pages 880-893, November 2012
The GREGOR Fabry-P\'erot Interferometer (GFPI) is one of three first-light instruments of the German 1.5-meter GREGOR solar telescope at the Observatorio del Teide, Tenerife, Spain. The GFPI uses two tunable etalons in collimated mounting. Thanks to
Externí odkaz:
http://arxiv.org/abs/1210.2921
Publikováno v:
Astronomy & Astrophysics, Volume 549, id.A24, 14 pp., 2013
The Ca II H line is one of the strongest lines in the solar spectrum and provides continuous information on the solar atmosphere from the photosphere to the lower chromosphere. We describe an inversion approach that reproduces observed Ca II H spectr
Externí odkaz:
http://arxiv.org/abs/1209.6194